[linux-2.6-block.git] / arch / c6x / include / asm / thread_info.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 *  Port on Texas Instruments TMS320C6x architecture
 *
 *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
 *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
 *
 *  Updated for 2.6.3x: Mark Salter <msalter@redhat.com>
 */
#ifndef _ASM_C6X_THREAD_INFO_H
#define _ASM_C6X_THREAD_INFO_H

#ifdef __KERNEL__

#include <asm/page.h>

#ifdef CONFIG_4KSTACKS
#define THREAD_SIZE		4096
#define THREAD_SHIFT		12
#define THREAD_SIZE_ORDER	0
#else
#define THREAD_SIZE		8192
#define THREAD_SHIFT		13
#define THREAD_SIZE_ORDER	1
#endif

#define THREAD_START_SP		(THREAD_SIZE - 8)

#ifndef __ASSEMBLY__

typedef struct {
	unsigned long seg;
} mm_segment_t;

/*
 * low level task data.
 */
struct thread_info {
	struct task_struct	*task;		/* main task structure */
	unsigned long		flags;		/* low level flags */
	int			cpu;		/* cpu we're on */
	int			preempt_count;	/* 0 = preemptable, <0 = BUG */
	mm_segment_t		addr_limit;	/* thread address space */
};

/*
 * macros/functions for gaining access to the thread information structure
 *
 * preempt_count needs to be 1 initially, until the scheduler is functional.
 */
#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.flags		= 0,			\
	.cpu		= 0,			\
	.preempt_count	= INIT_PREEMPT_COUNT,	\
	.addr_limit	= KERNEL_DS,		\
}

/* get the thread information struct of current task */
static inline __attribute__((const))
struct thread_info *current_thread_info(void)
{
	struct thread_info *ti;
	asm volatile (" clr   .s2 B15,0,%1,%0\n"
		      : "=b" (ti)
		      : "Iu5" (THREAD_SHIFT - 1));
	return ti;
}

#define get_thread_info(ti)	get_task_struct((ti)->task)
#define put_thread_info(ti)	put_task_struct((ti)->task)
#endif /* __ASSEMBLY__ */

/*
 * thread information flag bit numbers
 * - pending work-to-be-done flags are in LSW
 * - other flags in MSW
 */
#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */
#define TIF_SIGPENDING		2	/* signal pending */
#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
#define TIF_RESTORE_SIGMASK	4	/* restore signal mask in do_signal() */
#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */

#define TIF_MEMDIE		17	/* OOM killer killed process */

#define TIF_WORK_MASK		0x00007FFE /* work on irq/exception return */
#define TIF_ALLWORK_MASK	0x00007FFF /* work on any return to u-space */

#endif /* __KERNEL__ */

#endif /* _ASM_C6X_THREAD_INFO_H */
Commit	Line	Data
d2912cb1	1	/* SPDX-License-Identifier: GPL-2.0-only */
687b12ba AJ	2	/*
	3	* Port on Texas Instruments TMS320C6x architecture
	4	*
	5	* Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
	6	* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
	7	*
	8	* Updated for 2.6.3x: Mark Salter <msalter@redhat.com>
687b12ba AJ	9	*/
	10	#ifndef _ASM_C6X_THREAD_INFO_H
	11	#define _ASM_C6X_THREAD_INFO_H
	12
	13	#ifdef __KERNEL__
	14
	15	#include <asm/page.h>
	16
	17	#ifdef CONFIG_4KSTACKS
	18	#define THREAD_SIZE 4096
	19	#define THREAD_SHIFT 12
7b8fe057	20	#define THREAD_SIZE_ORDER 0
687b12ba AJ	21	#else
	22	#define THREAD_SIZE 8192
	23	#define THREAD_SHIFT 13
7b8fe057	24	#define THREAD_SIZE_ORDER 1
687b12ba AJ	25	#endif
	26
	27	#define THREAD_START_SP (THREAD_SIZE - 8)
	28
	29	#ifndef __ASSEMBLY__
	30
	31	typedef struct {
	32	unsigned long seg;
	33	} mm_segment_t;
	34
	35	/*
	36	* low level task data.
	37	*/
	38	struct thread_info {
	39	struct task_struct task; / main task structure */
687b12ba AJ	40	unsigned long flags; /* low level flags */
	41	int cpu; /* cpu we're on */
	42	int preempt_count; /* 0 = preemptable, <0 = BUG */
	43	mm_segment_t addr_limit; /* thread address space */
687b12ba AJ	44	};
	45
	46	/*
	47	* macros/functions for gaining access to the thread information structure
	48	*
	49	* preempt_count needs to be 1 initially, until the scheduler is functional.
	50	*/
	51	#define INIT_THREAD_INFO(tsk) \
	52	{ \
	53	.task = &tsk, \
687b12ba AJ	54	.flags = 0, \
	55	.cpu = 0, \
	56	.preempt_count = INIT_PREEMPT_COUNT, \
	57	.addr_limit = KERNEL_DS, \
687b12ba AJ	58	}
687b12ba AJ	59
687b12ba AJ	60	/* get the thread information struct of current task */
	61	static inline __attribute__((const))
	62	struct thread_info *current_thread_info(void)
	63	{
	64	struct thread_info *ti;
	65	asm volatile (" clr .s2 B15,0,%1,%0\n"
	66	: "=b" (ti)
	67	: "Iu5" (THREAD_SHIFT - 1));
	68	return ti;
	69	}
	70
687b12ba AJ	71	#define get_thread_info(ti) get_task_struct((ti)->task)
	72	#define put_thread_info(ti) put_task_struct((ti)->task)
	73	#endif /* __ASSEMBLY__ */
	74
687b12ba AJ	75	/*
	76	* thread information flag bit numbers
	77	* - pending work-to-be-done flags are in LSW
	78	* - other flags in MSW
	79	*/
	80	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
	81	#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
	82	#define TIF_SIGPENDING 2 /* signal pending */
	83	#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
	84	#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
6d665a4d	85	#define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */
687b12ba	86
687b12ba AJ	87	#define TIF_MEMDIE 17 /* OOM killer killed process */
	88
	89	#define TIF_WORK_MASK 0x00007FFE /* work on irq/exception return */
	90	#define TIF_ALLWORK_MASK 0x00007FFF /* work on any return to u-space */
	91
	92	#endif /* __KERNEL__ */
	93
	94	#endif /* _ASM_C6X_THREAD_INFO_H */